git.sur5r.net Git - i3/i3/blob - src/xinerama.c

   1 /*
   2  * vim:ts=8:expandtab
   3  *
   4  * i3 - an improved dynamic tiling window manager
   5  *
   6  * © 2009 Michael Stapelberg and contributors
   7  *
   8  * See file LICENSE for license information.
   9  *
  10  */
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <stdbool.h>
  15
  16 #include <xcb/xcb.h>
  17 #include <xcb/xinerama.h>
  18
  19 #include "queue.h"
  20 #include "i3.h"
  21 #include "data.h"
  22 #include "table.h"
  23 #include "util.h"
  24 #include "xinerama.h"
  25 #include "layout.h"
  26
  27 /* This TAILQ of i3Screens stores the virtual screens, used for handling overlapping screens
  28  * (xrandr --same-as) */
  29 struct screens_head *virtual_screens;
  30
  31 static bool xinerama_enabled = true;
  32
  33 /*
  34  * Looks in virtual_screens for the i3Screen whose start coordinates are x, y
  35  *
  36  */
  37 i3Screen *get_screen_at(int x, int y, struct screens_head *screenlist) {
  38         i3Screen *screen;
  39         TAILQ_FOREACH(screen, screenlist, screens)
  40                 if (screen->rect.x == x && screen->rect.y == y)
  41                         return screen;
  42
  43         return NULL;
  44 }
  45
  46 /*
  47  * Looks in virtual_screens for the i3Screen which contains coordinates x, y
  48  *
  49  */
  50 i3Screen *get_screen_containing(int x, int y) {
  51         i3Screen *screen;
  52         TAILQ_FOREACH(screen, virtual_screens, screens) {
  53                 printf("comparing x=%d y=%d with x=%d and y=%d width %d height %d\n",
  54                                 x, y, screen->rect.x, screen->rect.y, screen->rect.width, screen->rect.height);
  55                 if (x >= screen->rect.x && x < (screen->rect.x + screen->rect.width) &&
  56                     y >= screen->rect.y && y < (screen->rect.y + screen->rect.height))
  57                         return screen;
  58         }
  59
  60         return NULL;
  61 }
  62
  63 /*
  64  * Fills virtual_screens with exactly one screen with width/height of the whole X server.
  65  *
  66  */
  67 static void disable_xinerama(xcb_connection_t *connection) {
  68         xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(connection)).data;
  69
  70         i3Screen *s = calloc(sizeof(i3Screen), 1);
  71
  72         s->rect.x = 0;
  73         s->rect.y = 0;
  74         s->rect.width = root_screen->width_in_pixels;
  75         s->rect.height = root_screen->height_in_pixels;
  76
  77         TAILQ_INSERT_TAIL(virtual_screens, s, screens);
  78
  79         xinerama_enabled = false;
  80 }
  81
  82 /*
  83  * Gets the Xinerama screens and converts them to virtual i3Screens (only one screen for two
  84  * Xinerama screen which are configured in clone mode) in the given screenlist
  85  *
  86  */
  87 static void query_screens(xcb_connection_t *connection, struct screens_head *screenlist) {
  88         xcb_xinerama_query_screens_reply_t *reply;
  89         xcb_xinerama_screen_info_t *screen_info;
  90
  91         reply = xcb_xinerama_query_screens_reply(connection, xcb_xinerama_query_screens_unchecked(connection), NULL);
  92         if (!reply) {
  93                 printf("Couldn't get Xinerama screens\n");
  94                 return;
  95         }
  96         screen_info = xcb_xinerama_query_screens_screen_info(reply);
  97         int screens = xcb_xinerama_query_screens_screen_info_length(reply);
  98         num_screens = 0;
  99
 100         for (int screen = 0; screen < screens; screen++) {
 101                 i3Screen *s = get_screen_at(screen_info[screen].x_org, screen_info[screen].y_org, screenlist);
 102                 if (s!= NULL) {
 103                         /* This screen already exists. We use the littlest screen so that the user
 104                            can always see the complete workspace */
 105                         s->rect.width = min(s->rect.width, screen_info[screen].width);
 106                         s->rect.height = min(s->rect.height, screen_info[screen].height);
 107                 } else {
 108                         s = calloc(sizeof(i3Screen), 1);
 109                         s->rect.x = screen_info[screen].x_org;
 110                         s->rect.y = screen_info[screen].y_org;
 111                         s->rect.width = screen_info[screen].width;
 112                         s->rect.height = screen_info[screen].height;
 113                         /* We always treat the screen at 0x0 as the primary screen */
 114                         if (s->rect.x == 0 && s->rect.y == 0)
 115                                 TAILQ_INSERT_HEAD(screenlist, s, screens);
 116                         else TAILQ_INSERT_TAIL(screenlist, s, screens);
 117                         num_screens++;
 118                 }
 119
 120                 printf("found Xinerama screen: %d x %d at %d x %d\n",
 121                                 screen_info[screen].width, screen_info[screen].height,
 122                                 screen_info[screen].x_org, screen_info[screen].y_org);
 123         }
 124
 125         free(reply);
 126 }
 127
 128 /*
 129  * We have just established a connection to the X server and need the initial Xinerama
 130  * information to setup workspaces for each screen.
 131  *
 132  */
 133 void initialize_xinerama(xcb_connection_t *connection) {
 134         virtual_screens = scalloc(sizeof(struct screens_head));
 135         TAILQ_INIT(virtual_screens);
 136
 137         if (!xcb_get_extension_data(connection, &xcb_xinerama_id)->present) {
 138                 printf("Xinerama extension not found, disabling.\n");
 139                 disable_xinerama(connection);
 140                 return;
 141         }
 142
 143         if (!xcb_xinerama_is_active_reply(connection, xcb_xinerama_is_active(connection), NULL)->state) {
 144                 printf("Xinerama is not active (in your X-Server), disabling.\n");
 145                 disable_xinerama(connection);
 146                 return;
 147         }
 148
 149         query_screens(connection, virtual_screens);
 150
 151         i3Screen *s;
 152         num_screens = 0;
 153         /* Just go through each workspace and associate as many screens as we can. */
 154         TAILQ_FOREACH(s, virtual_screens, screens) {
 155                 s->num = num_screens;
 156                 s->current_workspace = num_screens;
 157                 workspaces[num_screens].screen = s;
 158                 memcpy(&(workspaces[num_screens++].rect), &(s->rect), sizeof(Rect));
 159                 printf("that is virtual screen at %d x %d with %d x %d\n",
 160                                 s->rect.x, s->rect.y, s->rect.width, s->rect.height);
 161         }
 162 }
 163
 164 /*
 165  * This is called when the rootwindow receives a configure_notify event and therefore the
 166  * number/position of the Xinerama screens could have changed.
 167  *
 168  */
 169 void xinerama_requery_screens(xcb_connection_t *connection) {
 170         /* POSSIBLE PROBLEM: Is the order of the Xinerama screens always constant? That is, can
 171            it change when I move the --right-of video projector to --left-of? */
 172
 173         if (!xinerama_enabled) {
 174                 printf("Xinerama is disabled\n");
 175                 return;
 176         }
 177
 178         /* We use a separate copy to diff with the previous set of screens */
 179         struct screens_head *new_screens = scalloc(sizeof(struct screens_head));
 180         TAILQ_INIT(new_screens);
 181
 182         query_screens(connection, new_screens);
 183
 184         i3Screen *first = TAILQ_FIRST(new_screens),
 185                  *screen;
 186         int screen_count = 0;
 187         TAILQ_FOREACH(screen, new_screens, screens) {
 188                 screen->num = screen_count;
 189                 screen->current_workspace = -1;
 190                 for (int c = 0; c < 10; c++)
 191                         if ((workspaces[c].screen != NULL) &&
 192                             (workspaces[c].screen->num == screen_count)) {
 193                                 printf("Found a matching screen\n");
 194                                 /* Try to use the same workspace, if it’s available */
 195                                 if (workspaces[c].screen->current_workspace)
 196                                         screen->current_workspace = workspaces[c].screen->current_workspace;
 197
 198                                 if (screen->current_workspace == -1)
 199                                         screen->current_workspace = c;
 200
 201                                 /* Update the dimensions */
 202                                 memcpy(&(workspaces[c].rect), &(screen->rect), sizeof(Rect));
 203                                 workspaces[c].screen = screen;
 204                         }
 205                 if (screen->current_workspace == -1) {
 206                         /* Create a new workspace for this screen, it’s new */
 207                         for (int c = 0; c < 10; c++)
 208                                 if (workspaces[c].screen == NULL) {
 209                                         printf("fix: initializing new workspace, setting num to %d\n", c);
 210                                         workspaces[c].screen = screen;
 211                                         screen->current_workspace = c;
 212                                         /* Copy the dimensions from the virtual screen */
 213                                         memcpy(&(workspaces[c].rect), &(screen->rect), sizeof(Rect));
 214                                         break;
 215                                 }
 216                 }
 217                 screen_count++;
 218         }
 219
 220         /* Check for workspaces which are out of bounds */
 221         for (int c = 0; c < 10; c++)
 222                 if ((workspaces[c].screen != NULL) &&
 223                     (workspaces[c].screen->num >= num_screens)) {
 224                         printf("Workspace %d's screen out of bounds, assigning to first screen\n", c+1);
 225                         workspaces[c].screen = first;
 226                         memcpy(&(workspaces[c].rect), &(first->rect), sizeof(Rect));
 227                 }
 228
 229         /* Free the old list */
 230         TAILQ_FOREACH(screen, virtual_screens, screens) {
 231                 TAILQ_REMOVE(virtual_screens, screen, screens);
 232                 free(screen);
 233         }
 234         free(virtual_screens);
 235
 236         virtual_screens = new_screens;
 237
 238         printf("Current workspace is now: %d\n", first->current_workspace);
 239
 240         render_layout(connection);
 241 }